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FTIR spectroscopic study of the complex formation between H+ and DMSO in Nafion
A I Karelin1, R R Kayumov1, E A Sanginov1
1Institute of Problems of Chemical Physics of RAS, 142432, 1 Academician Semenov avenue, Chernogolovka, Moscow region, Russia.
Abstract:
Nafion membranes plasticized with dimethyl sulfoxide (DMSO) have been examined at room temperature using the vacuum ATR - FTIR spectroscopic technique in the range 50-4000cm-1. The amount of the plasticizer corresponds to the molecular ratio n=DMSO/H+=1.2, 2.3, 4.8, 7.0, 9.7 and 13.3. The medium intensity band with two maxima at 780 and 853cm-1 have been assigned to the ν(SO) stretching vibrations of the H+(DMSO)2 complex. The possible reason of ν(SO) splitting is symmetry decrease of hydrogen bond under the influence of the anion group SO3- electric field. Whereas the mutual association of free DMSO molecules in Nafion leads to appearance of weak band at 86cm-1 assigned to the dipole-dipole interactions.
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